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ENGLISH.TXT
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1992-03-02
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______ GHOST.PRG _____________________________________ 01 Mars 1992 __
Formatter and copier for ALADIN®, SPECTRE® and MACINTOSH® diskettes.
Author: Miguel SARO
NOTICE: The author has placed this programme in the Public Domain in the
hope that you will find it useful, but he cannot give any
guarantee as to its reliability (in other words use it at your
own risk). It was developped using SOZOBON C and GULAM (many
thanks to their respective authors). No version number has been
assigned to it, simply a creation date it used.
The programme is mainly aimed at SPECTRE users who wish to convert
files from the now defunct ALADIN format. Although SPECTRE 3.0 (the
latest version at the time of writing) allows you to read the old 9-
sector 696k ALADIN discs directly under MAC emulation this is only true
if your MAC system does not reside on a SPECTRE-format floppy (as is the
case for SPECTRE 128 owners without a hard disc). SPECTRE becomes
confused between the 9 and 10 sector formats that it has to deal with
simultaneously. So ALASPEC (the predecessor to GHOST) was born to
convert between the two formats under GEM.
The problem of exchanging files between SPECTRE 128 (no GCR
capability) and a real MAC, however, still remained. GHOST resolves this
by making use of the fact that all MACs with High Density drives (e.g.
the MAC Classic, MAC LC, MAC II's etc) can handle discs written using
MFM (Modified Frequency Modulation) so that MS-DOS discs can be read
using Apple File Exchange. It just so happens that if the MFM diskette
contains a valid MACINTOSH file structure (MFS or HFS) then it can read
and written directly by the MAC. The diskette does however have to be
formatted using 9 sectors per track (720k max) with information being
successively written on one side and then the other as each track fills
up. SPECTRE-format diskettes do no however use this arrangement, they
first fill up one side of the diskette and the fill up the other side,
as well as having 10 sectors per track (800k max).
GHOST converts diskettes between these two formats. Obviously you
cannot squeeze a 800k SPECTRE diskette into a 720k MFM diskette, but if
the top 160 sectors of the SPECTRE diskette do not contain any useful
information nothing will be lost in the conversion. You can usually make
sure this is true. Should individual files be too big to be contained on
a 720k diskette they can split into two or more smaller ones using
something like Stuffit.
What follows is a very brief list of the capabilities of GHOST but
should be sufficient to use it without any trouble.
____Format Information:
Only double-sided MFM diskettes can be handled by GHOST which treats
them according to their physical structure rather than their contents:
__TYPE___| tracks sectors organisation capacity
ALADIN | 79 9 alternating sides 696k (1)
MAC_MFM | 80 9 alternating sides 720k
ALADIN v3| 80 10 alternating sides 800k
SPECTRE | 80 10 successive sides 800k
(1) - The first track on each side is reserved for GEM.
____Settings:
Drives : A, B(if it exists)
Types : ALADIN, Mac_MFM, ALADIN version 3, SPECTRE
Capacities : 696k, 720k, 800k.
Modes : MFS(Macintosh File System), HFS(Hierarchical File System)
____Operation:
Start the programme under GEM in the usual way (it does not use
either of the emulators). Click on the various boxes shown in the
display window to correspond the the required operation.
For "COPY" and "FORMAT & COPY"
You have to chose the structure of the source diskette and that
required for the destination. The capacity of the destination
has to be limited to that of the source.
For "FORMAT"
You have to chose the structure of the diskette to be formatted
as well as its capacity and logical organisation.
If you click on the "?" for either of the diskettes it will try
to determine the structure of that diskette. If it displays
"ALv3_SPct" it means that it cannot tell whether it is an ALADIN
version 3 diskette or a SPECTRE diskette.
Click on the operation to be perfomed.
The programme will never refuse the requested operation, but the
result obtained depends on how accurately the settings were chosen.
It is possible to copy a SPECTRE 800k diskette to a 696k ALADIN
one!! - you will lose the excess and the MAC system will ask you if
you want repair the diskette.
The programme has dialogues in both English & French (since the
author is French):
____To change language: (French/English)
While running : click on "Help/Aide" at the top right of the
window then on "Continue", on the next screen
click on either "Francais" or "English" to chose
that one. Click on "Return/Retour"
Changing default : while on the second screen described above,
clicking on "set default lang." will save the
current setting to the programme itself so that
it will be this language used when it is next
re-started.
___ I wish to thank my friends: Yves LAGARDE for his suggestions after
testing and Paul DAGLEISH for the same reason but also for his
translation into English of the programma dialogue and this documen-
tation (you're welcome - PD :-) ).
___ If you have any comments or wish to contact me please write to me at
the following address (I don't have access to the net) :
M. SARO
Help Informatique
7, rue de Strasbourg
38000 GRENOBLE
France.